As far as your courses go I wouldn't have the faintest idea as I've never looked into any of them.
As far as working in year 12 goes, I think it's a positive thing so long as you keep your priorities straight and your life in balance (not meaning to sound cliche).
10 hours is definitely reasonable on an organised timetable. I'd also be taking into account your ATAR aims - If you wanted 99.95 I'd probs just go lock myself in my school forever, but for anything else you should do fine.
Some things to consider on part-time work are
-Organisation and balance.
How will your shifts and study time be organised? If you were aiming for 10 hours, would it be benefical to have for example, four hours on a Monday from 4-8pm and an hour and a half study with a <11pm bedtime and six horus on Saturday? Or would it be better to work consistently throughout weekdays and have a small quanity of homework left for the weekend and work five hours on Saturday and Sunday? Also, set yourself limits. Being eager for money, if you were employed on a casual basis and your employer called you on a Thursday and said "Hey can you please work until 10pm from as soon as you can get here - we're dying!!!!" it would be relatively easy to ditch study and go make some dollars, but if you set boundaries with yourself/your employer to only doing your rostered shifts this shouldn't be a problem.
-Flexibility
Some weeks in Year 12, point blank, you are going to get raped with homework. There was one week earlier in the year where my school had a curriculum day following a public holiday, so ten hours of class time was missed. This made my teachers go "Hey guys, you're gonna have loads of free time, here's a shit load of set work for you" which promptly made me cover my shifts for that weekend. Some weeks you might be on the ball and be miles ahead and think you can pick up an extra shift (I know this might sound contradictory to my above point) but flexibility in your workplace is something to keep in mind.
-Priorities.
Make school come first, always.
-and with anything, Correct nutrition and sleep.
If you decide to work something like a 5-10pm shift on a Tuesday night, ensure you're eating a proper meal in your break perhaps, and not going home and getting back that five hours at work with five hours of homework until 3am. I work at a Macca's and it's a bad habit of mine to smash down shit food in my break, go home, and do what I would have done while I was at work until the early hours of the morning.
All that being said, if you work and it's too much you can always hand in your letter of resignation lol.
Tl;dr. By all means have a part-time job and leave it if it's shit.
I'm sure 17k, especially if you continue to work small amounts during Uni, will be in excess of what you could need providing you stay with your parents.